cho x;y;z t/m
$ \dfrac{x^{2} +y^{2} +z^{2}}{a^{2}+ b^{2} + c^{2}} $=$ \dfrac{ x^{2} }{ a^{2} } + \dfrac{ y^{2} }{ b^{2} } + \dfrac{ z^{2} }{ c^{2}} $
tính M= $ x^{2011} + y^{2011} + z^{2011} $
15-07-2011 - 12:03
14-07-2011 - 18:30
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12-07-2011 - 23:37
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